Update Library Items produces a "?"

For some reason my library lost the path to some of my images. I need to update a group of them. Any ideas why this happened or how to fix it?

Nevermind, I figured it out. I had moved the files. I put them back where they were before hand and updated - got all check marks. I wish there were some way to "update" the library path instead of where my files are. I didn't really want them back in the other spot, but I guess I'll have to settle for that.